I noticed that Red Alert had recently been upped so I though I would add the Expansion pack 'Counterstrike' to the set. Aftermath can be found HERE
I have also found a link to a page with the required patches if you don't already have them (but if you have Red Alert you really should have them already), click HERE for the patches.
Also a game for the PSone called 'Red Alert: Retaliation' was released which included FMV's that never saw the light of day on the PC version, however if you go HERE you can download these FMV's and add them to the PC version. All the instructions to do this are at the page the link refers to.
Image of the FMV's only found on the PSone game
The file is a disk image created with Alcohol 120%, the contents of the rar are as follows:
(File sizes are the packed size).